Platform scale



Feb. 5, 1923. 1,444,190

B. W. KING. PLATFORM SCALE. FILED APR. BO, 1 919 3 SHEETS-SHEET l gig.;

Feb. 6, 1923. 1,444,190

B. W, vKING. Y PLATFORM SCALE. FILED APR. 30, 1919. 3 SHEETS-SHEET 2 Feb. 6, 1923. 1,444,190

B. w, Kms.

PLATFORM SCALE. FiLED APR, 30, 1919. 3 SHEETS-SHEET 3 Patented eb. 6, 1923.

PATENT OFFICE.

BERT W. KING, F DETROITMICHIGAN, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE COMPUTING SCALE COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

PLATFORM SCALE.

Application led April 30, 1919. Serial 1101293339.

To all wlw/m t may concern.'

Be it known that I, BERT W. Kmq, being a citizen of the United States, residing at Detroit, in the county of Waynel and State of Michigan, have invented certain new and useful Improvements in Platform Scales, of which the following is a full, clear, and exact description.

This invention relates to weighing scales,

` and while certain features are applicable to scales of other types the invention in its present; form pertains more particularlyto so-called platform counter scales provided with means to indicate the weight or value of the commodities, or both. The chief object of theinvention is to provide a simple scale of durable construction which wi-ll stand long use without getting out of order. To this and other ends the invention consists in the novel features and combinations hereinafter described.

One form of the invention is illustrated in the accompanying drawings, in which Fig. 1 is a plan view of the base-lever system, the pedestal being in horizontal section and the base housing or cover being broken away, and the platform removed.

Fig. 2 is a front view and Fig 3 is a side view, portions of the base housing, pedestal and drum casing |being broken away to show the interior parts.

The main lever 10 is substantially in the form of a rectangular frame, provided at front i. e., away from the pedestal with two widely spaced forwardly extending lugs 11 having knife-edges 13 resting on the agates 14 suitably mounted on the stationary posts 15 rising from the base 16 and forming the fulcrum. At the rear the lever is provided with two rearwardly extending arms 17, 18, the first connected to a coil spring 19 which counterbalances the platform lever system. The other arm, 18, is connected to an upwardly extending draft-rod 20, more fully described hereinafter.

The auxiliary or secondarylever 21 "is a transverse frame arranged inside of the main lever, and is provided with forwardly and rearwardly extending arms 22, 23 at its sides. The latter carry inverted knifeedge pivots 24 engaging agates in the upper ends of the links 25 pivoted at their lower ends on the base 16. These links constitute a swinging fulcrum for lever 21.` The arms 22 also have inverted knife-edge pivots 26, on which rests the bea-ring frame 27. Between the f ront and rear arms-the lever is provided vwith agates 28 bearing on inverted nife-edge pivots 29 carried by the sides of the Ina-in lever 10.

-The bearing frame 27, which is roughly trlangu'lar 1n form, carries the platform 30, and at its rear end or apex is provided with a vertical check arm 31 connected at its upper end to a check line 32. As will be seen 1n Figs. l and 2, the check arm 31 is in the form of a channel and extends upwardly in the pedestal 33.

From the foregoing it will be seen (Fig. 3) that the weight of the goods on the plat form 30' rocks lever 21 counterclockwise on its swinging fulcrum 25, and that the lever 21 in turn rocks lever 1'0 clockwise on its fixed fulcrum 15. Considering the Weight of the goods to be the power, it will be seen that lever 21 iS of the second class and that lever 10 is of the third class. Lever 10 is preferably bent at the knifeeedges 29 so that the latter may range properly with the knife-edges 13 and .34.

The draft rod 20, previously referred to as connected to the main base-lever 10, is forked at its upper end provided with eyes engaging knife-edges 35 (Fig. 2) on a lever 36 in the lower part of the drum housing 37. This lever (of the third class) is fulcrumed at one end in the shackle 38 and at its other end is connected (by the means presently to be described) to the load-counterbalancing springs 51. Fixed by one arm to a pair of depending lugs 40 is a U-shaped thermon stat 41 (made upl of two metal bars having different coefficients of expansion) which has its other arm `connected to a shiftable bar 42 extending parallel to the lever below the same. At. one end this bar is connected to a coil spring 43. The other end of the spring is adjustably connected to a. lug 44'on the lever by means of a bolt 45 and nut 46. The other end of the rod 42 carries a block 47 having side-plates embracing the end yof tending from the ears 54. At the top the springs are connected to an equalizer bar pivoted .at its center to a support 56 suitav y bly fastened on the adjacent circular end plate 56a of the drum housing 33.

.of the same..

The dashpot 57 is carried by the yoke 50 and extends downwardl vbetween the arms The das pot plunger 58 is pivotally connected at its top to the springequalizersupport 56.'

The drum 59, .which may be of the usual computing type, is fixed on av shaft 60 mounted torotate in ball-bearings in the drum-housing end plates.' One end of the shaft has a pinion 61 meshing with av verf' 'tical rack-62 `pivoted at its lower end to a vertical arm 63 which is itself pivoted on the adjacent end of the lever 36. The rack 'is .also provided with a light counterbalancing weight 64, which urges thev rack counterclockwise (as viewed in Fig. 3) and -so keeps it in proper mesh with the pinion -61 as will be readily understood.

2Ihe operation of the scale described is as follows: When the goods to bev weighed are placed on the platform 30, Fig. 3, the

lever 21 is rocked counterclockwise draw- Y ing down the Vdraft-rod 20 and rocking lever 36 clockwise on its fulcrum 38 against the tension of springsl. Thisv also moves the rack 62vdownwardly and rotates pinion 61 and drum 59.

As the temperature increases, the arm of the thermostat 41 which is connected to the bar 42 '(Fig. 2) swings toward the right (because of the different coefficients of expansion of the two metals composing the thermostat) thereby shifting. the block 47 outwardly. This lengthens the lever-arm to which springs 51 .are connected,thus compensating for the softening of the springs due to the increase of temperature. As theI temperature decreases the block 47 is moved inwardly, thus compensating foi` the stiffening of the sprin v tis to be unrstood that the invention is not limited to the construction herein specifically illustrated and described but can be embodied in other forms without departure from its spirit as defined by the ap-r pended claims.

I claim: w

1. In a scale, a lever system comprisin in combination, a main lever composed ofg an open frame having apair-of rearwardly extending arms, a spring load counterbalancev means connected to one of said arms, a spring lever counterbalancing means connected to the other, a secondary lever pivotally connected to the main lever. a fulcrum for the main lever, a fulcrum for the secondary lever, and a platform support pivotally connected to the secondary lever.

2. In a scale, the. combination of a main lever composed of an open frame, loadcounterbalancing means connected to the main. leverat the rearhthereof, a fulcrum for the main lever, a secondary llever extending. .from side to side of the main lever and larranged within the same and having fulcrum pivots, bearingsffor the fulcrum p1vots,piv

otal means connecting. ther secondary lever and the main lever to rock the latter, and a platform-support vpivotally connected to the secondary lever.

3. In a scale, thecombmation vof a main lever-'composed of an open frame having a pair of'forwardly extending arms provided with pivots and-a pair of rearwardly extending arms provided with pivots, fulcrum- \bearings for the forward pivots, lever-counterbalancing means connected to one of the rearwardly extending arms and load-coun terbalancing means connected to the other,

a secondary leverextending from side to side -of the main lever within the same and havin a pair of rearwardly extendingr arms provi edl with pivots and a pair of forwardly extending arms provided with pivots, fulcrum-bearings for'the rearward pivotsof, the second lever, pivotal means conl necting the main lever to the secondary lever between the forward and rearward pivots of the latter, and a platform support connectedto the forward pivots of the. secondaryv lever.

4. Ina scale, the combination of a main lever having a pair of pivots at its' rear end, a fulcrum for the lever, a platform support, means operatively connecting the platform support and the main lever to rock the latter on its fulcrum,`a spring connected with one of said pair of pivots on the, main lever to counterbalance the main lever and the scale parts supporte-d thereby, means connected withthe other pivot of said pair. to variably counterbalance va load placed o'n the platform, and indicating means connected to the mainI lever and responsive to the movements thereof.

5. In a scale, .the combination of a main lever composed of an open frame of substantiallyA rectangular form having a'. pair lof forwardly extending arms and a pair of rearwardly extending arms provided with- .thereof between the adjacent forward and rearward pivots of the secondary lever.

6. In a scale, the structure set forth in vclaim 5, in lconI binaton with spring. means connected to one of the rearward pivots of the main lever to counterbalance a load placed on the platform, and spring means connected with the other of said forward pivots to counterbalance the main lever and the scale parts carried thereby.

7. In a scale, in combination, a main lever having a pair of rearward pivots, a lever counterbalancing spring connected to one of said pivots, a load counterbalancin'g spring, connections extending therefrom to the other of said pivots, and temperature compensating mechanism operatively connected with the aforesaid connections to vary the force received from said main lever and exerted upon the load counterbalancing spring. n 8. In a scale, in combination, a main lever having a rear pivot, a draft-rod connectedv to said pivot, a lever connected to the draftrod for` actuation thereby, a counterbalancing spring, a connection between the spring and the second named lever, and thermostatic means carried by the second named lever to vary the spring connection therewith to compensate for temperature changes.

9. InI a scale, in combination, a lever, a yoke having arms on opposite sides .of the lever, a pair of springs each connected by one end to an arm of the yoke and having their other ends suitably supported, a. shiftable connection between the yoke and the lever, thermostatic means carried by the lever to shift said connection to compensate for temperature changes, and means for connecting to the lever a support for the goods to be weighed.

10. In a scale, in combination, a lever, a yoke having depending arms on opposite sides of the lever, a pair of counterbalancing springs'each connected by one end to one ofthe yoke arms and having its other end .suitably supported, a carrier arranged to slide longitudinally on the lever between the arms of the yoke and having pivots engaging said arms, and thermostatic means carried by the lever and connected with said carrier to shift the latter to compensate for temperature changes.

11. In a scale, in combination, a lever, a yoke having depending arms on opposite sides of the lever, pivotal connecting means between the yoke arms and the lever, a pivotally mounted equalizing bar, and a pair of springs connected by one end to the ends of the equalizing bar and at their other ends Aconnected to the respective arms of the yoke.

12. In a scale. i'n combination, a lever, a

. yoke having arms on opposite sides of the a springattached at its ends to the shiftable connection and the lever, and means for connecting to the lever a support for the goods to be weighed.

14. In a scale, in combination, an indicating drum, a weight supporting platform, a base lever system to support the same, a lever disposed below the indicating drum and sub-V stantially parallel with the same, connections between said base lever system and said lever, a spring counterbalance for said lever at the end of said drum, and operating connections between the lever and the indieating drum. i

15. The invention as set forth in claim 14, in which the lever is provided with a variable connection to the spring counterbalance and in which a thermostat is provided upon said lever to vary the said connection upon a variation of temperature.

16. In a drum scale, the combination of an indicating drum, a drum housing for supporting the same, a lever disposed below and longitudinal to the axis of the drum and fulcrumed in asupport depend-ing from the drum housing, a spring counterbalance for said lever, thermostatic means carried by the lever for varying the leverage exerted upon said spring by said lever under varying temperature conditions, 'and means depending from the lever and extending ,drum and fulcrumed at one end thereof, a

spring counter-balance for said lever at the opposite end thereof, a draft rod intermediate the ends of the lever and connecting the same to the base lever system and operating connections between the lever andthe said indicating drum.

. 18. In a, scale, in combination, a ,drum housing and a pedestal housing, an indicating drum in said housing, a lever within said drum housing and disposed longitudinally below the same, a spring counterbalance connected with said lever within the drum housing, an operating connection between the lever and the indicating drum, and a dra-ft rod in said pedestal housing-con nected at its upper end witla said lever and at its lower end connecting with a support for the goods to be weighed.

19. In a scale, in combination, a base lever shiftable connections upon oneend of said lever, a yokeconnectedthereto, a pair-of load counterbalancin'g-'springs connected to p said yoke, Va bifurcated draft rod connecting the ase lever system with said lever, a rack pivoted upon said lever to operate the drum and a thermostat carried by the said lever for shifting the said. shiftable connection's:`

` 20. The invention as set forth in claim 19,

in which a dashpot is connected to the yoke and in which the counterbalancing springs are supported attheir -upper ends by an eq ua-lizing bar.

2l. In a scale,'in4 combination, a base lever system comprising a lever of the second order and a lever of the third order, a draft rod connected to one of said levers` a lever of the third order connected to said draft rod, spring load counterbalancing meansconnected to said third order lever, and thermostatic means carried by said lever for varying the effective leverage between the lever and said counterbalancing means,'whereby variations in the spring due to temperature are compensated.

22. I'n a 'weighing scale in combination a base housing, a pedestal,v a drum housing, an indicating drum therein, load counterbalancing means within said drum housing and' driving connections for the drum including a steelyard extending downward in the, pedestal into the base housing, a main lever of the second order having a pair of pivots fulcrumed within the forward part of the base housing, a nose iron extending rearvwardly from said lever and connecting with the aforesaid steelyard, an open framed supplementary lever within the base housing having a pair of fulcrum pivots disposed at the,rear thereof and having provisions for preventing the, upward tilting of the lever under load, double pivotal connections from the said supplemental lever to the main lever at the sides thereof` a bearing frame, a double pivotal connection between said frame and the supplementary lever lfor supporting said fra-me on the lever, and a check device forlmaintaining the bearing frame in horizontal position.

23. A base lever for a drum scale, comprising in combination a base housing, a main lever of the second order having a rearwardly extending arm constituting a nose iron, said lever having a pair of fulcrum pivots and cooperating bearings at the front of the' housing, a secondary lever fulcrumed at the rear of the housing and pivotally connected to the main lever at a'point intermediate the fulcrums, of the main andsecondary levers, and a bearing supported entirely upon the secondary lever. 24, base lever system frame pivotallyJ prisingin combination, a base housing, a-v

mainlever of the second order having a rearwardly extending 'arm constltutmg a nose iron, sald lever having a pair of Vulcrum pivotsand cooperating-bearings at theIl front of the base housing,

a secondary lever fulcrumed at the rear of the houslng and pivotally connected to the main lever at -points intermediate the fulcrums of the main pivotally supported, at a pair of aligned piv-l lever composed of an open frame portion having a pair of forwardly extending arms provided with pivots and a rearwardly extending arm constituting a nose iron portion, bearings for the forward pivots constituting a fulcrum for the main lever, a secondary lever composed of an open frame and having a pair of forwardly extending arms and a pair of rearwardly extending arms, each of said arms being provided with a pair of pivots, a bearing frame entirely pivotally mipported upon the forward pivots ofthe secondary lever, said rear pair of pivots having cooperating bearings and forming a fulcrum for the secondary lever anda pair of pivotal connections intermediate the secondary lever and the main lever.

26. A base lever system for a weighing scale adapted to be entirely housed within a housing, comprising in combination .with the housing, of a pair vof main lever bearings within and at the front of the housing, a `pair of secondary lever bearings within and at the rear o-f the housing, a main lever of the second order fulcrumed upon said forward bearings, a secondary lever fulcrumed by double pivotsupon said rear bearings, a pair of pivot connections to impart force fromthe secondary to the main lever at a point between the main and supplementary bearings, all of the aforesaid otal connections being entirely within the housing, and a bearing frame supported solely by a single pair of aligned pivots carr1ed Aby the secondary lever, said bearing fr ame having portions lthereof projecting `Wlthout the housing to support a receiver for the goods to be weighed.

27. In a scale, in combination, a base lever system, a draft rod connected thereto, a lever connected to the draft rod, spring counterbalancing means connected to said lever, and 'a thermostat carried by said lever for varying the counterbalancing means and the lever.

28. In a scale, in combination, a base lever system compr1sing der and a lever ofthe Athird order, a draft levers and piv' a leven, of the second orpoint of connection of the spring rod connected to one of said levers, a lever of the third order connected to said draft rod. spring load counterbalancing means connected to said third Order lever, and thcrmostatic means carried by said lever for varying the effective leverage between the lever and said counterbalanoing means whereby variations in the spring due to temperature are corrected.

2S). ln a scale, in combination, a base lever system, a lever, a draft rod connecting the lever and the base lever system, a spring counterbalancing means connected to said lever, a weight indicator, a connection between the lever and indicator, and a thermostat carried by the lever for varying the point of connection of the lever and spring counter-balancing means to compensate for variations in the flexibility of the spring counterbalancing means under varying temperature conditions.

In testimony whereof I hereunto allix my signature.

BERT W. KING. 

